In all the years I have been using La Bella on my Hohner, I have never broken a string despite heavy bending and being a bit bad with changing strings (longest I had a set on was 2 years!).
After an initial tune in / play stage they keep their tuning exceptionally well. Sound is not as crisp as some other brands I have tried, but it is still quite good (best way to describe them is they lack a bit of high frequency ring). Only other complaint would be they are a bit too expensive for what they are.